noun
a person who is regarded as weak or contemptible, especially one who cries or complains in a feeble way
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The sniveler complained about every little inconvenience during the meeting.
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I can't stand that sniveler who is always whining about everything.
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Why is that sniveler always being such a crybaby?
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The sniveler's constant complaints were like nails on a chalkboard to everyone around them.